(19)
(11) EP 1 596 375 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
17.10.2007 Bulletin 2007/42

(43) Date of publication A2:
16.11.2005 Bulletin 2005/46

(21) Application number: 04027893.9

(22) Date of filing: 24.11.2004
(51) International Patent Classification (IPC): 
G11B 7/0065(2006.01)
 G11B 7/135(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LU MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL HR LT LV MK YU

(30) Priority: 10.05.2004 KR 2004032781

(71) Applicant: Daewoo Electronics Corporation
Seoul (KR)

(72) Inventor:
  • Jung, Kyu-Il,
    Seoul (KR)

(74) Representative: Jacoby, Georg et al
Samson & Partner, Widenmayerstrasse 5
80538 München
80538 München (DE)

   


(54) Mirror angle measurement and servo control apparatus for holographic digital data storage system


(57) A mirror angle measurement and a servo control apparatus for a Holographic Digital Data Storage (HDDS) system is disclosed. The mirror angle measurement apparatus includes a first mirror (110) having a first reflecting surface by which the reference beam is reflected toward the holographic medium (116), and a second reflecting surface (114) by which a control beam is reflected to adjust the incident angle of the reference beam; a transmission unit (122,124,126) for providing the control beam to the second reflecting surface; a second mirror (128) for returning the control beam to the second reflecting surface; and a photo detector (132) unit for detecting the amounts of the control beam. The angle of the first mirror is adjusted based on a comparison result between the amounts of the control beam detected by the photo detector unit.







Search report